Saw-filing machine.



PATENTED MAY 2, 1905. J. E. GLBMONS.

SAW FILING MACHINE.

APPLICATION FILED FEB. 20.1903.

2 SHEBTSSHBBT 2.

@W aka puma NHED STATES Patented May 2, 1905.

ATENT FFlQE.

SAW-FILING MACHINE.

SPECIFICATION forming part of Letters Patent No. 789,119, dated May 2, 1905.

Application filed February 20, 1903. Serial N0. 1 14,246.

To all whom, it may concern.-

Be it known that I, J OSEPH E. OLnMoNs, a citizen of the United States of America, residing at Littleton, in the county of South Arapahoe and State of Colorado, have invented certain new and useful Improvements in Saw-Filing Machines; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the figures of reference marked thereon, which form a part of this specification.

My invention relates to improvements in saw-filing machines; and it consists of the features, arrangements, and combinations hereinafter described and claimed, all of which will be fully understood by reference to the accompanying drawings,in which is illustrated an embodiment thereof.

In the drawings, Figure 1 is a top or plan view of my machine. Fig. 2 is an end elevation of the same. In this view the arm carrying or reciprocating mechanism stands at right angles to the saw-holding clamp. Fig. 3 is a top view of the reciprocating mechanism and the swinging arm upon which it is mounted, the parts being shown on a larger scale than in Figs. 1 and 2. Fig. 4: is a side elevation of the same. Fig. 5 is a cross-section taken through the jaws of the saw-holding clamp. Fig. 6 is a similar View showing the adjustable support for the clamping-jaws in two positions, one being in full lines and the other in dotted lines. In this view one of the jaws of the clamp is detached. Fig. 7 is a fragmentary front view, partly in section, illustrating the feed-screw and showing its connection with the depending nut of the carriage. Fig. 8 is a front end view of the arm 28, illustrating the depending guide or shoe.

The same reference characters indicate the same parts in all the views.

Let the numeral 5 designate a suitable frame upon which is mounted two upright yoke parts 6, connected by parallel bars 6, forming a carriage mounted to slide on flanges 5 of the frame. To the yokes or end pieces of the carriage are respectively secured, by

bolts 7, two plates 7. These plates 7 form an adjustable support for the jaws 8 and 8. The jaw 8 is rigidly secured to the plates 7, while the jaw 8 is pivoted on the said plates, whereby it may be opened and closed at pleasure, according as it may be required to remove the saw 9 or clamp it in place. The jaws are provided with upwardlyprojecting frame parts 8 and 8 which give a leverage for the clamping-jaws. Upon the frame part 8 of the stationary jaw is pivotally mounted a locking device 10, provided with notches adapted to engage a pin 12, mounted on the frame part 8 of the movable jaw.

J ournaled in the frame 5 is a feed-screw 13, which engages a depending nut 14:, fast on the carriage. The feed-screw is provided at its outer extremity with a hand-crank 14 to facilitate the manipulation of the screw. The carriage is provided with a pointer 15 and the frame with a graduated part 5, adjacent which the pointer travels as the carriage is moved endwise, through the instrumentality of the feed-screw, in order to bring the teeth of the saw successively into line or position to be acted on by the file of the reciprocating device hereinafter explained.

Projecting from one side of the frame 5 is a semicircular bar or plate 16, supported by braces 16*, connected with the body of the framework. This plate 16 forms a support for the laterally-projecting bar 17, whose inner extremity is pivotally mounted and slidably adjustable on the frame by means of a bolt 18, passed through a slot formed in its forward extremity, a thumb-nut 19 being applied to the upper or threaded extremity of the bolt for locking the bar in any desired position of adjustment. It is evident that in filing different saws it will be necessary to change the angle of the file, and consequently of the bar 17, with reference to the direction of travel of the saw-holding carriage. Slidably mounted on the frame-bar 17 is a rod 20, whose extremities engage boxes or guides 21 and 22, mounted in the said bar. The rod 20 is actuated by a pitman 23, connected with a crank 24, made'fast to a shaft 25, journaled in the outer extremity of the bar 17 and operated bya hand-crank 26. Rigidly connected with the rod 20, but offset therefrom by a part 20, is a short bar 20", extending parallel with the main bar 20. Pivotally connected with this part 20 by means of a bolt 27 is an arm 28. The part 20 is open at the top to receive the rear extremity of the arm 28, which is provided with a tongue through which the bolt 27 passes. The part 20 is closed at the bottom from the pivot 27 to its forward extremity, thus giving a supportto the arm 28 to prevent the latter from moving downwardly too far in the performance of its function. Hence the arm 28 has a limited vertical oscillation to allow the file 30 the upward-anddownward movement required in performing the saw-filing act.

Pivotally mounted in the forward extremity of the arm 28 is a part 31, provided with a lug 31, adapted to receive the tail or reduced extremity of the file 30, the latter being locked in the lug by means of a set-bolt 32, threaded in an opening in the top of the lug, which opening intersects the socket which receives the file. The part 31 may be turned in the arm 28 to adjust the file 30 to bring it into proper relation with reference to the teeth of the saw. This part 31 is held in any desired position of adjustment by means of a setbolt 31.

Mounted on the forward extremity of the framebar 17 below the arm 28 is a plate 33. This plate is provided with an ear 34, pivotally connected with the bar by means of a screw 35 and supported from below by a stoppin 36. The plate 33 is normally held downward in contact with this pin by a leaf-spring 37, secured to the bar, as shown at 38, and engaging the said plate from above and near its forward extremity. The arm 28 is provided with a depending an gle-shaped guide 39, which cooperates with the plate 33, as hereinafter explained.

Attached to the bar part 20 at its junction with the part 20 is a leaf-spring 40, which is held in place by a bolt 41. The forward extremity of this spring bears upon the forward portion of the arm 28 and holds the last-named arm downwardly during the forward movement of the file incident to the performance of the saw-filing function. During the rearward movement of the rod 20 and its attachments the guide 39 rests on the top of the plate 33, whereby the file 30 is raised from the saw-teeth, as is necessary during the backward stroke of the file. When, however, the arm 28 has reached its rearward limit of movement, the guide 39 drops from the rear end of the plate 33 and the spring 40 acts on the arm 28 to hold it downwardly, so that the file shall engage the tooth to be sharpened during its forward movement. Just before the file reaches its forward limit of movementthe bottom of the guide engages the forward extremity of the plate 33, which lies in its path, and lifts the said plate; but 'the guide before it ceases to move forwardly leaves the plate 33, which is then quickly thrown downwardly against the stop 36 by the spring 37, so that when the file begins the return movement the bottom of the guide strikes the upper surface of the forward extremity of the plate 33, whose upward inclination raises the arm 28 and its attachments, whereby the file is lifted from the saw-teeth during the return stroke.

The arm 28 is provided with a pointer 42, projecting above a transverse graduated plate 43, to indicate the degree of movement of the lug 31 during the adjustment of the latter f fr the purpose ofregulating the angle of the fi e 30.

In the operation of my improved device the saw is clamped between the jaws of the carriage in the manner heretofore explained. The bar 17 is then adjusted to give the file the proper angle with reference to the saw or the line of travel of the carriage. The bar 17 is then secured on the frame by tightening the thumb-nut applied to the bolt forming the pivot of the bar, after which the machine is ready for use. The turning of the crank 26 reciprocates the file, which acts on the saw during the forward movement to perform the sharpening function. During the forward movement of the file the bottom or foot of the guide 39 passes below the switch-plate 33, which is held at its downward limit of movement by the spring 37. Just before reaching its forward limit of movement the foot of the guide engages the forward extremity of the plate 33 and raises it; but as soon as the guide passes beyond the forward extremity of the said plate the latter is released and drops to its normal position and the foot of the guide rides upwardly on the plate and lifts the file free from the saw during the return movement. After filing one tooth or the opposite edges of the two teeth the feed-screw is turned to move the carriage along to bring the space between the next two-teeth into position to allow the file to enter, when the operation is repeated. It will be understood that in filing a saw the two edges of each tooth are oppositely beveled, necessitating the reciprocation of the file in different directions when filing these two edges. Hence one edge of each tooth is filed with the file running in a given direction, after which the bar 17 is shifted to throw the file in another direction, and the operation is continued to sharpen the other edge of eachsaw-tooth. It will be readily understood that my construction is well adapted for this use. After filing the two adjacent edges of any two teeth one tooth is skipped or passed by before the file is again let into place, and after the saw has been acted on in this manner its entire length the movement of the carriage is reversed and the saw fed in the opposite di- IIO rection during the operation of filing the other edges of the teeth at a difierent bevel, the bar 17 being shifted accordingly.

An ordinary screw-clamp 44: (see Figs. 1 and 2) may be employed to lock the bar 17 to the plate 16 when the said bar is properly adjusted.

Having thus described my invention, what I claim is 1. The combination with asuitable frame, of a carriage mounted to travel thereon, separated end plates pivotally adjustable on the carriage, two longitudinally disposed saw clamping jaws whose extremities are connected with the plates, one jaw being stationary and the other having its extremities pivoted in the end plates, the jaws having upwardly-extending frame parts, and suitable means for locking the jaws in the closed position.

2. The combination with a suitable support, of a part mounted to reciprocate thereon, an arm jointed to the reciprocating part which part supports the arm against downward movement beyond a certain level, a spring attached to the reciprocating part and hearing upon the arm to hold the latter at its downward limit of movement, a switch-plate provided with a support, its forward extremity being normally lowermost, a stop to limit the downward movement of said plate, a spring having. a tendency to hold the plate against said stop, a shoe attached to the said arm and provided with a foot arranged to pass beneath the plate when making one stroke of the reciprocation, and to ride upon the plate when making the opposite stroke, and a fileholder adjustably connected with the forward extremity of the said arm.

In testimony whereof I aflix my signature in presence of two witnesses.

JOSEPH E. CLEMONS.

Witnesses:

DENA NELsoN, IDA E. OBRIEN. 

